I have noted others saying this particular model works OK, and these were bought from a reputable Aussie retailer.

That model is annoying. It has given me trouble with my 1541U-II as well. Something about it makes it a bit incompatible I guess. It works with some things but doesn't with others.
My iBook G4 also does NOT like that USB stick.

I know it's super tempting to get it because of its ultra small profile (so it doesn't stick out of your AMiga much), but I bought two different ones and they have all given me trouble. I ended up using them where they worked: my Raspberry Pi and my XBox 360.